First detection of ND in the solar-mass protostar IRAS16293-2422*

Author： Bacmann A. Caux E. Hily-Blant P. Parise B. Pagani L. Bottinelli S. Maret S. Vastel C. Ceccarelli C. Cernicharo J. Henning T. Castets A. Coutens A. Bergin E. A. Blake G. A. Crimier N. Demyk K. Dominik C. Gerin M. Hennebelle P. Kahane C. Klotz A. Melnick G. Schilke P. Wakelam V. Walters A. Baudry A. Bell T. Benedettini M. Boogert A. Cabrit S. Caselli P. Codella C. Comito C. Encrenaz P. Falgarone E. Fuente A. Goldsmith P. F. Helmich F. Herbst E. Jacq T. Kama M. Langer W. Lefloch B. Lis D. Lord S. Lorenzani A. Neufeld D. Nisini B. Pacheco S. Pearson J. Phillips T. Salez M. Saraceno P. Schuster K. Tielens X. van der Tak F. F. S. van der Wiel M. H. D. Viti S. Wyrowski F. Yorke H. Faure A. Benz A. Coeur-Joly O. Cros A. Güsten R. Ravera L.

Publisher： Edp Sciences

E-ISSN： 1432-0746|521|issue|L42-L42

ISSN： 0004-6361

Source： Astronomy & Astrophysics, Vol.521, Iss.issue, 2010-10, pp. : L42-L42

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Abstract

Context. In the past decade, much progress has been made in characterising the processes leading to the enhanced deuterium fractionation observed in the ISM and in particular in the cold, dense parts of star forming regions such as protostellar envelopes. Very high molecular D/H ratios have been found for saturated molecules and ions. However, little is known about the deuterium fractionation in radicals, even though simple radicals often represent an intermediate stage in the formation of more complex, saturated molecules. The imidogen radical NH is such an intermediate species for the ammonia synthesis in the gas phase. Many of these light molecules however have their fundamental transitions in the submillimetre domain and their detection is hampered by the opacity of the atmosphere at these wavelengths. Herschel/HIFI represents a unique opportunity to study the deuteration and formation mechanisms of species not observable from the ground.